High porosity growing medium


PRO-MIX® HP® AGTIV® REACH™ is perfect for growers that require a growing medium with good drainage, high air porosity and low water retention. The combination of fibrous Sphagnum peat moss and a high percentage of coarse perlite makes this formulation ideal for growers who require a growing medium product that is adapted to their needs for watering flexibility and crop seasonality. PRO-MIX® HP® AGTIV® REACH™ contains a beneficial endomycorrhizae that improves plant growth.


  • Dries out more frequently than general-purpose peat‑based mixes
  • Well suited for low-light and high-humidity growing conditions
  • More difficult to overwater crops
  • Reduces incidence of water-related problems (root diseases, algae and fungus gnats)
  • Holds less water for improved leaching of fertilizer salts during crop cycles
  • Supports plant root systems
  • Enhances nutrient and water uptake 
  • Produces more vigorous and healthy plants

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Recommended Usages

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Foliage plants
Potted flowering plants

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Greenhouse vegetables
Vegetable transplants
Young plant propagation


Inert ingredients

  • Sphagnum Peat Moss (65-75%)
  • Perlite
  • Calcitic and dolomitic limestone
  • Wetting Agent

Active ingredients

AGTIV® REACH™ technology develops the root system, increasing nutrient and water uptake, which promotes plant growth, robustness and vigor.

  • Expands root system 
  • Enhances nutrient and water uptake 
  • Produces more vigorous and healthy plants 

Physical Properties

Particle Size: 

Air Porosity: 

Water Holding Capacity: 

Bulk Density: 

Code Size  Units per pallet Weight
20281RG 2.8 cu ft Loose 57 25 - 35 lb
20381RG 3.8 cu ft Comp. 30 60 - 75 lb
20801RG 80 cu ft Loose 2 700 - 850 lb
21351RG 135 cu ft Comp. 1 2200 - 2700 lb
"I’ve been using PRO-MIX® since 1991 because of its perfect quality and unbeatable results. "

Saul Sanchez, Head Grower
Green Things. Tucson, AZ

"Best growing media"

Ian Gumto
Erich Gumto Greenhouses


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Veriflora Responsibly Managed Peatlands

Premier Tech’s peat moss comes from bogs that are certified under the Veriflora Program. This certification ensures the application of good management principles in all aspects of sustainable development. The criteria include environmental assessment, social engagement, and product quality.

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Premier Tech, the Company Behind the Brand

Experts at your Service

Our dedicated team of experts is committed to ensuring that professional growers maximize the potential of PRO-MIX® products. We offer comprehensive support to help you enhance your expertise and achieve optimal results in your cultivation endeavors.

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Premier Tech Growers and Consumers Unmatched consistency
Premier Tech Growers and Consumers Superior quality

Superior Quality

We meticulously choose each element of our products, from the carriers to the biological active ingredients, and all other components in between. Our rigorous quality control spans from the bio fermenters to the final formulated products, ensuring every aspect meets our high standards. This meticulous attention to detail offers you peace of mind, knowing you're receiving only the finest quality products.

Unmatched Consistency

Our beneficial microorganisms are seamlessly integrated into our growing media. We meticulously verify the viability and efficacy of each batch produced, guaranteeing that your chosen product maintains its quality and delivers consistent results every time.

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Expert service

Frequently Asked Questions

To use PRO-MIX® HP®, open the package, remove some PRO-MIX® product and place into a large tub or container. Lightly break up any clumps so that the PRO-MIX® is light and airy. Most growers prefer to add a small amount of water prior to filling containers. If you add water, add enough so that the PRO-MIX® product is slightly moist to the touch. Do not saturate. Fill flats, containers and/or pots, without compacting the PRO-MIX® in the container. Plant your seedlings, young plants, etc., then water in containers.

PRO-MIX® BX is a general-purpose growing medium, compared to PRO-MIX® HP® which is a High Porosity growing medium. These products are the same in pH and chemical properties.  The difference is that PRO-MIX® HP® contains a higher percentage of perlite than PRO-MIX® BX. Perlite is a porous aggregate that does not absorb water.

When incorporated into growing media, perlite provides air porosity and reduces water retention. Since PRO-MIX® HP® contains a higher percentage of perlite than PRO-MIX® BX, HP® holds less water and is better suited for crops that are sensitive to overwatering, to low light growing conditions or for use in winter months when daylight is shorter.

Using the Saturated Media Extraction test method (SME), PRO-MIX® HP® is formulated in a pH range of 5.2-6.2. Once the product is opened, crops planted and watered, limestone is activated and pH will reach 5.8-6.2 within 7-10 days.

We do not recommend reusing PRO-MIX® HP® or any growing medium. There are many good reasons not to reuse, including changes to chemical and physical properties over time, diminished effect of wetting agent after use and/or transmission of root diseases to newly planted crops.

When irrigating, add water to PRO-MIX® HP® until it is saturated from top to bottom of the container. You will know you have accomplished this when water runs out of the drainage holes at the bottom of the container. Over time, allow the growing medium to dry-out without applying additional water. You will know when to apply water again when the surface of the growing medium turns color from a dark brown/black (wet) to a light brown/tan color (dry enough to rewater).

Yes, PRO-MIX® contains a starter fertilizer to help plants acclimate to a new rooting environment. We strongly recommended to initiate a fertilizer program within 7-10 days after planting. The fertilizer program you select should take into consideration water quality, crop type and the stage of plant growth.

PRO-MIX® HP® can be used for transplanting seedlings. However, we suggest PRO-MIX® FPX for seed starting and seed germination.

PRO-MIX® HP® is a peat-based growing medium formulated with a high percentage of perlite. PRO-MIX® HP® and all PRO-MIX® growing media products are 'soilless', meaning that they do not contain any mineral soil.

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